Cell C horrible service since inception of contract

im having real issues with Cell C. Firstly, they threw me around because they couldnt pick up my router issued to me, then they could and couldnt again.. Once i told them to cancel everything, suddenly the next day the router came. So thats the 1st issue I had and it got sorted. My bill was supposed to be R478 roughly but ends up being over R600 pm because of extra services I never asked for. So last month I used the ussd to cancel the services, which was successful. Now its on my account again??. BUT the biggest issue I have now is that my bill comes up to R1600+ after my 100GB day and 100GB night data. I have never finished my day data before, suddenly thats finished and I went over by R1600??? i spoke to Nthabiseng and she said her teamleader Namsanga /Nomsa will call me, this person never did. I even told them that the sim in question is always in my router so they need to call me on the alt nr on their system and I even confirmed it.. After no call from the teamleader, I called back and spoke to Patricia who will send the ref nr to my alt cell as prev stated and i still havent received the ref nr for a ticket that needs to be logged to data validation or something in that line.. This is shocking service because they dont get back to me, they *****ed up my initial contract by not finding me on the system, My account is still more than the R480+- after I diabled the added services and now im sitting with a account for next month of R1600+.. I have been patient so far but going to lose my cool very very very soon. Is it that difficult to get decent service and not be *****ed over with bills?????